My name is Peter Grant, and I'm a keeper of the secret flame. Truth be told, there's a lot I still don't know. My superior Nightingale is trying to teach me proper schooling for a magician's apprentice. But even he doesn't have all the answers. A mutilated body in Crawley means another murderer is on the loose. But then I get word of something very odd happening in Elephant and Castle. Just the typical day for a magician constable.

"There have been ghosts on the London Underground, sad, harmless spectres whose presence does little more than give a frisson to travelling and boost tourism. But now there's a rash of sightings on the Metropolitan Line and these ghosts are frightening, aggressive and seem to be looking for something. Enter PC Peter Grant junior member of the Metropolitan Police's Special Assessment unit a.k.a. The Folly a.k.a. the only police officers whose official...